Powertrain, generic (extended)

P2AF5 Starter Relay C Stuck On

Check engine lightOn
EmissionsNot relevant
Drive cycleRequired
Limp modeNo

P2AF5 means starter relay C remains in its energised state when it should have dropped out. Stellantis uses it as Starter Relay 3 Stuck On for the power control relay of its dual-battery stop-start system: Jeep Grand Cherokee 2021 to 2025, Wagoneer and Grand Wagoneer 2022 to 2025, RAM 1500 2025, and earlier Pacifica, Durango, Compass, Wrangler and Gladiator. In normal driving the relay is released and closed, so the main battery also charges the auxiliary one; if the PCM still sees a voltage gap between the two above a calibrated limit, it stores P2AF5 and disables stop-start. Owners report no cranking, no start or a dead auto-stop function. Stellantis checks battery terminals, the 150 A fuses and distribution centre connections, and notes false fails with a flat auxiliary battery that a battery disconnect clears.

Likely causes

Loose or corroded B+ connection at main or auxiliary battery
Depleted auxiliary battery causing a false fail
Open or poorly seated 150 A fuse or fuse array
Power control relay mechanically stuck

Symptoms

  • No crank or no start
  • Stop-start inoperative, service message for the system
  • Auxiliary battery not being charged

Repair estimate

DifficultyEasyDIY possible
Parts and labour€0–350
Time0.3–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

starter relay cwiring harnessecm

Related codes

P2AF6P2AF2P2AFAP00FDP0562P26F0

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.